Off-forum: DIY laptop battery, any one ?

Go To Last Post
9 posts / 0 new
Author
Message
#1
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hey guys.
Im having an idea here, my new laptop is a very light 13" one... but its only having a 4-cell battery with 2500mAh.
So the boy inside me is thinking:
If I get the right connector and the pin out, and 4x 5000mAh LiPo batteries.
Shouldn't I then be able to make my own DIY battery for my laptop ?
Have anyone done this trick ?

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I think laptop Lithium-based battery packs normally come with a little PCB that monitors temperature / cell voltage / charge/discharge current. If said PCB noticed anything funny going on it might disable the output. Also your motherboard may well talk to this PCB via something like I2C and not allow you to connect raw cells. Probably best searching for information about your specific laptop battery pack.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I have tried to find some data... but haven't found that much on mine (nothing) only on dell and ibm's ... and mostly its just how to change the batteries to new once

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

DIY battery replacement.

http://www.batteryspace.com/

I have used them to replace the Li cells in my HP camera battery packs and NiMH cells in a Fluke scope.

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

"Lithium batteries for laptops" are not simply rechargeable cells connected in series! It is a misunderstanding and actually an improper word for describing these embedded systems. They have the built in nv memory and uC with firmware which drives the cells at an optimal point, guarantees safety and performance.

If you want to extend the power performance of your laptop:

    - buy additional battery. Switching them is inconvenient, because you need to disable or hibernate at least.
    - buy an external battery, which simply replaces your power adapter. Cells can be of any kind, preferably universal NiMH (AA) if you want to travel with it and Lead-Acid (several times cheaper, but twice as heavy) if you just want to use your laptop at camping site.
    - install and use power schemes, monitor power consumption. Mind some software is buggy and for example I have the dictionary which runs CPU at 80% when it is in the scope (without a single click!).

No RSTDISBL, no fun!

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Charles Darwin, Lord Kelvin & Murphy are always lurking about!
Lee -.-
Riddle me this...How did the serpent move around before the fall?

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Do not buy it! The seller did not specify the weight of it! It has the nominal capacity of 1.37MJ and no datasheet.

No RSTDISBL, no fun!

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

I grant that weight was mot specified, but a battery of Dimension: 207 x 124 x 16 mm is a fairly big battery.
No doubt you could ask the seller the weight. I did not see where the 1.37MJ spec. comes from?

Charles Darwin, Lord Kelvin & Murphy are always lurking about!
Lee -.-
Riddle me this...How did the serpent move around before the fall?

  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

20000mAh*3600s*19V=1.37MJ

No RSTDISBL, no fun!